Last night I got the first ceiling panel up and the first pair of overhead lights mounted.
I measured and drilled cut-outs for the lights before mounting the ceiling panels and ran wires to connect 4 of the over-bed lights parallel to one another. This will go to its own switch.
When I got the panel up and slid the wires through it looked like this...
I chose the lights based on reading a few amazon reviews, but the best summary is on http://faroutride.com/led/
They are Acegoo LED Lights. They have a soft white version with a white or silver rind. I had 4 from my previous build and added another 8 to this one.
Here is a photo from FarOutRide's van build of the lights on and off.
the first pair mounted...
...and turned on. They work!
The lights are very low profile, but the ceiling panels sit very close to the furring strips and insulation. The lights are being pushed slightly back through the holes, so I'm going to find some white felt or some other white rubber to make a little puck that allows the lights to sit 1/8 to 1/4" lower.